how to implement a function in a different D source file

[mipri]

On Tuesday, 26 November 2019 at 03:06:52 UTC, Omar wrote:
> the page here https://dlang.org/spec/function.html
> suggests you can implement a function in a different file
...
> mentioned the endeavour of no-bodied-functions as a way of 
> presenting a black-box type of interface.

oh, that's what you were asking.

Consider:

   $ cat interface/references.d
   module references;

   string greeting();

   $ cat implementation/references.d
   module references;

   string greeting() {
       return "Hello, Dave";
   }

   $ cat main.d
   import references;

   void main() {
       import std.stdio: writeln;
       writeln(greeting);
   }

And trying to build it:

   $ dmd -c implementation/references.d
   $ dmd -Iinterface -c main.d
   $ dmd main.o references.o
   $ ./main
   Hello, Dave